Klay -> Kaia in RPC

[ian0371]

Proposed changes

• Change all RPCs klay_ to kaia_
• Redirect RPC requests klay_ to kaia_ (replaces RPC namespace alias kaia -> klay #2157)
• Add js console kaia; both klay and kaia are compatible with all nodes (see further comments)
• Change peb/ston to wei/gwei
• klay namespace in RPC_API env var at node launch is recognized as kaia
• Missed ones from Klaytn -> Kaia in local variables, strings #2155

Types of changes

• Bugfix
• New feature or enhancement
• Others

Checklist

• I have read the CONTRIBUTING GUIDELINES doc
• I have signed the CLA
• Lint and unit tests pass locally with my changes ($ make test)
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)
• Any dependent changes have been merged and published in downstream modules

Further comments

sequenceDiagram
    actor User
    participant Console
    participant Server
    
    rect rgb(191, 223, 255)
    note right of Console: Console init (autocomplete)
    Server->>Console: {kaia,eth,net,...}
    Console->>Console: Embed {kaia,klay,eth,net,...}
    end

    rect rgb(191, 223, 255)
    note right of User: RPC request
    User->>Console: kaia.getCode
    Console->>Server: klay_getCode
    Server->>Server: klay_ -> kaia_getCode
    Server->>Console: 0x..
    Console->>User: 0x..
    end

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